Laws of Chemical Combination MCQs
Practice Laws of Chemical Combination multiple-choice questions from Atoms and Molecules (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Laws of Chemical CombinationQuiz - Solve & Score
Q1. Which postulate of Dalton's atomic theory directly explains the law of conservation of mass?
- A.atoms are neither created nor destroyed in a chemical reaction
- B.atoms of different elements have different masses
- C.atoms combine in small whole-number ratios
- D.atoms are divisible into electrons
Answer: A. atoms are neither created nor destroyed in a chemical reaction
Q2. Which postulate of Dalton's theory explains the law of constant proportions?
- A.atoms combine in a fixed, simple whole-number ratio in a given compound
- B.atoms are neither created nor destroyed
- C.atoms are indivisible
- D.all matter is made of atoms
Answer: A. atoms combine in a fixed, simple whole-number ratio in a given compound
Q3. Which observation would VIOLATE the law of constant proportions if it were ever found true?
- A.pure water samples with different hydrogen-to-oxygen mass ratios
- B.all pure water having the same 1:8 H:O ratio
- C.mass being conserved in a reaction
- D.excess reactant remaining unreacted
Answer: A. pure water samples with different hydrogen-to-oxygen mass ratios
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